Poorest service by Vodacom SA

Contract upgrade: 30/01/16 at Vodashop (Liberty Midlands Mall, Pietermaritzburg) & took iPhone 6S<br> Fingerprint scanner went faulty three days later on 2-2-16 and returned the phone. Phone was checked and tested by consultant and technician [Joss] and it was indeed faulty & was sent to a Vodacom center in DBN. Got a call saying after vigorous tests by vod technicians, there was nothing wrong with phone and I should collect (19/02/16). Went to collect and tested the phone in store ONLY to find out that the scanner was still faulty. I got the manager and technician to test it and agreed that the phone was faulty. The phone was sent to JHB vod center. Got a call today 29-02-16 saying the phone isn't faulty and I should collect it. When it arrives at PMB, I will collect and test it and I KNOW that it is still FAULTY...WHAT kind of tests do you do at vodacom??? It has been 27 days and I don't have a phone that I am paying for.